| Autor: |
M A Guzmán-Cruz, J G Pacheco-Sosa, L Morales de la Garza, A I Gochi Bautista, J A Medina-Cervantes, E D Gutiérrez-López, S Fuentes-Moyado, J N Díaz de León |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Materials Research Express, Vol 11, Iss 5, p 055507 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2053-1591 |
| DOI: |
10.1088/2053-1591/ad48e0 |
| Popis: |
In this study, we prepared Al _2 O _3 -TiO _2 (AT) mixed oxides to synthesize NiW catalysts for sulfur removal reactions. The AT support samples were prepared with various surfactants. Additionally, gallium atoms (2.4 wt%) were introduced as an additive to coat the outer surface layers of AT support that lacked Al ^3+ or Ti ^2+ cations. Characterization results showed substantial differences in textural properties, chemical composition, and surface acidity. The x-ray Photoelectron Spectroscopy (XPS) and High-Resolution Transmission Electron Microscopy (HR-TEM) results demonstrated that the NiW/AT-L-Ga sample has a better combination of dispersion, sulfidation, and promotion among materials. The sulfided NiW/AT-L-Ga catalyst had the highest catalytic activity. After incorporating Ga, XPS observed that the activity could be associated with an increase in the NiWS active phase; however, including a surfactant in the synthesis of the support allowed an increase in the amount of NiWS phase. The active phase was modeled considering the HR-TEM results for the slab length, revealing the atoms at the border susceptible to promotion. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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